Anthropic's `claude-code-darwin-arm64` binary update hints at Claude Opus 4 and 4.1 model

EXHIBIT 2315 · URGENT

Oct 27, 2026 01:09 UTC binary @anthropic-ai/claude-code-darwin-arm64

Anthropic's `claude-code-darwin-arm64` binary update hints at Claude Opus 4 and 4.1 model references, new beta file APIs, and internal debugging/telemetry features.

✓ VERIFIED — BEAT THE ANNOUNCEMENT BY 23.5H · AUTO-VERIFIED AGAINST ANTHROPIC NEWS

READY TO POST:

anthropic's latest claude-code binary on arm64 macs references "opus 4" and "opus 4.1". might be internal model ids or upcoming versions. keeping an eye out!

looks like some new beta file apis and internal debugging tools are shipping in the new anthropic claude-code binary. interesting for devs looking at early access features.

⚠️ FROM COMPILED BINARY — lower confidence, verify before posting. (May include bundled-dependency strings, not just first-party changes.) @anthropic-ai/claude-code-darwin-arm64 2.1.310 -> 2.1.311: +15063 strings, -12223 strings, 45 interesting [model_id] (3) + - Fixed \`/autocompact\` and \`/effort\` saving to the wrong model when a gateway names Opus 4 or 4.1 with a prefix, such as \`anthropic/claude-opus-4-1\` + /$bunfs/root/claude-code.d.ts-05d57da5.txt.zst + /$bunfs/root/claude-platform-on-aws-j618x3y8.md [feature_flag] (34) + - Fixed requests failing behind some gateways and compatible servers that reject the \`effort-2025-11-24\` beta value or mid-conversation system messages; Claude Code now retries without them + - Fixed the /claude-api skill saying that \`ant beta:worker poll --on-work\` passes trace context to the command + - Fixed the \`prompt-caching-scope\` beta header being sent behind custom \`ANTHROPIC_BASE_URL\` gateways and on Foundry, where it has no effect + - [VSCode] Fixed the mic button showing an internal error message when you are signed out of claude.ai; it now offers to sign you in + <${sB}>No completion record was found for them in the previous session. ${w} Task ids in this notification beginning with "${lt}" are internal scan markers, not tasks.</${sB}> + @internal A cloud worker's report, before its first turn, of which asks it inherited and keeps. Any ask stored before this event that it does not name is over. + @internal As process_garbage_collections on the success result. + @internal As process_start_purge_delay_ms on the success result.? + @internal As process_start_tuning on the success result.@ + @internal How many stream events the API sent on those streams, as tengu_api_success's streamEventCount counts them: keepalive pings that the CLI makes up itself are left out. A stream still open when this result is built adds none. + @internal How many streams process_wall_ms_streaming covers: one for ea